Teeth for roll scrapers and trash bar plates



March 11, 1941. i L. MENZL' 2,417,210 I TEETH FOR ROLL SCRAPERS AND TRASH'BAR PLATES Original Filed Feb.- 29, 1940 INVENTOR.

' L50 Mz/vzz.

- HTTORNEY v Patented Mar. 11, 1947 TEETH FOR ROLL SCRAPERS AND TRASH BAR PLATES Leon Menzl, Crestwood, N. Y., assignor to Marlo Company, New York, N. Y., a. copartnership consisting of Harold Case and Charles Gersinan Original application February 29, 1940, Serial No. 321,386. 'Divided and this application September 24, 1943, Serial No. 503,637

The invention relates to scraper tip and trash plate teeth for removing material from the grooved surfaces of mechanical rolls and more particularly of cane sugar mill rolls. Heretofore it has been customary to out such teeth with a shaper tool or milling cutter advancing in Straight lines whereby triangular teeth were produced having straight point lines and straight base or root lines in parallel relation to each other.

The object of the invention is to provide teeth of the indicated type in a novel form whereby operative efliciency is increased and waste of material in the cutting of said teeth is reduced to a minimum.

Other more specific objects will appear from the description hereinafter and the feaures of novelty will be pointed out in the claim.

The present application is a division of another application filed by me in the United States Patent Oflice on February 29, 1940, Serial No. 321,386, which has issued as Patent No. 2,334,276, dated November 16, 1943.

In the accompanying drawings which illustrate examples of the invention without defining the limits thereof, Figs. 1 and 2 are diagrammatic views illustrating respectively the old form of scraper teeth and the instant novel form thereof; Figs. 3 and l are corresponding views respectively of the old and new trash bar plate teeth; and Fig. 5 is a diagrammatic view of a cane sugar mill showing scraper bars and trash bar plate with the novel teeth in use. Fig. 6 is a sectional view on the line 6-6 of Fig. 5. In Fig. 5, the arrows indicate the direction of movement of the material.

In this improved tooth a, the point line b and the line at the root of the tooth or base line 0 are preferably both curved in arcs'corresponding with the radius of the mill roll 01 with which said tooth is intended to cooperate; that is the radius of curvature of the base line 0 of the tooth a is equal to the radius from the center of the mill roll d to the peripheral surface thereof, or in other words to the point line e of a given mill roll tooth f, and the radius of curvature of the point line b of the tooth a is the same as the radius from the center of the mill roll d to the base of the mill roll tooth f or in other words to the root g of a given groove of the mill roll (1. In some cases, however, the point line b of the tooth a may be a straight line which in practice extends in approximate root g of the mill roll 11 as shown in Fig. 4.

The purpose of developing the novel tooth a is tangential relation to the 1 Claim. (01. 100-47) to provide a tooth which meshes perfectly with the grooves of the mill roll (1; in other words, the novel tooth a, fits perfectlythe mill roll groove at the point line b, the root or base line 0, as well as at the sides of said tooth a.

As clearly shown in Figs. 1 and 3, it is evident that in a tooth'generated by a linearly reciprocating tool, considerable material is removed at the root or base line of the tooth as indicated at h with resulting excessive waste. Also a tooth thus formed at best has contact only'with the side surfaces of the associated mill roll teeth and because of its straight point and base lines does not conform to the surface curvature of the mill roll or its groove at the base line thereof. As illustrated in Figs. 2 and 4, it is evident that with the novel tooth or having the desired curved base line 0 no excessive waste of material occurs and at the sametime a perfect co-operating fit with the point line e of the'mill roll tooth and the associated groove of the mill roll is secured; if the point line bof the tooth a is also curved, perfect fit with the base line g of the mill roll groove is also attained. It will be understood that the teeth of the roll scrapers and of the trash bar plates may be correspondingly developed to include the aforesaid novel features.

In Fig. 5 which diagrammatically illustrates a cane sugar mill, it] represents the top roll, the grooves H of which are cleaned by the teeth of the top roll scraper l2, and I3 indicates the side roll of said mill, the grooves M of the roll 13 being cleaned by the teeth of the side roll scraper 15. The trash bar plate l6 whereby material is conducted from the front roll I! to the side roll 13 beneath the top roll l0, has its teeth 16a extending into meshing engagement with the grooves l8 between the teeth 18a of the front roll H for cleaning said grooves l8. The recess G in Fig. 6 shows one of the conventional recesses in roll I1, into which the juice flows. It will be understood that the scrapers l2 and I5, and the trash bar plate 16 are mounted in proper place in the cane sugar mill in any conventional and well-known way.

With the novel teeth, excessive waste of material in cutting is avoided, as previously stated herein, and a perfect surface mesh with the grooves of the particular mill roll is effected whereby any material which may be in the grooves of said mill roll is removed therefrom in a most efficient manner.

Various changes in the specific forms shown and described may be made within the scope of the claims without departing from the spirit of REFERENCES CITED the Invention The following references are of record in the I claim:

For use in combination with a cylindrical roll me of this patent of a sugar mill which has circumferential V- 5 UNITED STATES PATENTS shaped grooves, a scraper member which has Number N t teeth which mesh perfectly with said grooves, 733,125 Bekker July 7, 1903 said teeth fitting said grooves at the respective 1,698,088 Franke Jan. 8, 1929 point lines and base lines of said teeth and also 1,787,937 Dunn Jan. 6, 1931 at the sides of said teeth. 2,061,196 Hymers Nov. 17, 1936 LEON MENZL. 2,030,982 Grossenbacher Feb. 18, 1936 

